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From: "rvmallad at amazon dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/107413] Perf loss ~14% on 519.lbm_r SPEC
 cpu2017 benchmark with r8-7132-gb5b33e113434be
Date: Mon, 07 Nov 2022 07:42:00 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: missed-optimization
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X-Bugzilla-Who: rvmallad at amazon dot com
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X-Bugzilla-Assigned-To: wilco at gcc dot gnu.org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107413

--- Comment #11 from Rama Malladi <rvmallad at amazon dot com> ---
(In reply to Wilco from comment #10)
> I'm seeing about 1.5% gain on Neoverse V1 and 0.5% loss on Neoverse N1. I=
'll
> post a patch that allows per-CPU settings for FMA reassociation, so you'll
> get good performance with -mcpu=3Dnative. However reassociation really ne=
eds
> to be taught about the existence of FMAs.

Thank you very much Wilco.=